Photochemical studies of a sulphonated derivative of 1,3-Diphenyl-2-pyrazoline

1975 ◽  
Vol 28 (9) ◽  
pp. 2083 ◽  
Author(s):  
IH Leaver ◽  
GC Ramsay ◽  
LJ Stephens
Keyword(s):  
Aqueous Solution ◽  
Vinyl Alcohol ◽  
Wool Fibre ◽  
Poly Vinyl Alcohol ◽  
Simulated Sunlight ◽  
Fluorescent Whitening Agent ◽  
Whitening Agent

The photochemistry of the sulphonated pyrazoline fluorescent whitening agent sodium 4-(3?-phenyl-2?-pyrazolin-1?-yl)benzenesulphonate has been examined in aqueous solution, in films of poly(vinyl alcohol) and in the wool fibre. Photooxidation to give the pyrazole occurs almost quantitatively in solution, but accounts for only half of the photoproducts formed in the polymer. In the wool fibre, pyrazole formation accounts for more than half of the pyrazoline whitener destroyed during exposure to simulated sunlight.

Multiporous open-cell poly(vinyl formal) foams for sound absorption

RSC Advances ◽  
2016 ◽  
Vol 6 (9) ◽  
pp. 7653-7660 ◽  
Author(s):  
Bai Xue ◽  
Jianguo Deng ◽  
Junhua Zhang
Keyword(s):  
Aqueous Solution ◽  
Vinyl Alcohol ◽  
Sound Absorption ◽  
Poly Vinyl Alcohol ◽  
Open Cell

A series of multiporous open-cell poly(vinyl formal) (PVF) foams were obtained by crosslinking poly(vinyl alcohol) (PVA) with different contents of formaldehyde in aqueous solution.

Novel pH-Sensitive Poly(Vinyl Alcohol) Based Polyampholyte as Pervaporation Membrane

2016 ◽  
Vol 852 ◽  
pp. 979-983
Author(s):  
Ping Rui Meng ◽  
Liang Bo Li
Keyword(s):  
Aqueous Solution ◽  
Vinyl Alcohol ◽  
Water Resistance ◽  
Graft Copolymerization ◽  
Sodium Acrylate ◽  
Poly Vinyl Alcohol ◽  
Permeate Flux ◽  
Ft Ir ◽  
Ethanol Aqueous Solution ◽  
Poly Acrylamide

Sodium acrylate (NaAA) and acrylamide (AM) were grafted onto poly (vinyl alcohol) (PVA) using potassium persulfate as an initiator, Graft copolymerization namely poly (vinyl alcohol)-g-poly (acrylamide/sodium acrylate) (PVA-g-PAM/SAC). The poly (vinyl alcohol)-g-poly (vinylamine/sodium acrylate) (PVAMC) was prepraed by Hofmann rearrangement.The PVAMC homogeneous membrane was characterized by fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM).The water resistance of the PVAMC membranes is the best when pH of the PVAMC solutions was 4, at that time the numbers of-NH3+ and-COO- groups trended to be equal, so the isoelectric point was pH=4. At 90 °C the pervaporation of PVAMC composite membrane was tested and showed that the separation factor and the permeate flux were about 1001 and 1341 g/(m2·h) for 90wt% ethanol aqueous solution, and they were about 1297 and 1040 g/(m2·h) for 90wt% isopropanol aqueous solution.

Effect of ZnO nanoparticles on the electrospinning of poly(vinyl alcohol) from aqueous solution: Influence of particle size

2013 ◽  
Vol 54 (9) ◽  
pp. 1969-1975 ◽  
Author(s):  
Tongsai Jamnongkan ◽  
Ryo Shirota ◽  
Sathish K. Sukumaran ◽  
Masataka Sugimoto ◽  
Kiyohito Koyama
Keyword(s):  
Aqueous Solution ◽  
Particle Size ◽  
Zno Nanoparticles ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol

scholarly journals DYNAMICAL ASPECTS OF SOL-GEL TRANSITION IN AN AQUEOUS SOLUTION OF POLY (VINYL ALCOHOL)

1984 ◽  
Vol 40 (4-5) ◽  
pp. T158-T160
Author(s):  
Motoko Komatsu ◽  
Takashi Inoue ◽  
Keizo Miyasaka
Keyword(s):  
Aqueous Solution ◽  
Vinyl Alcohol ◽  
Sol Gel ◽  
Poly Vinyl Alcohol ◽  
Sol Gel Transition ◽  
Gel Transition
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